331 in words
331
three hundred and thirty-one
331 is written three hundred and thirty-one.
Ways to write it
- As an ordinal
- three hundred and thirty-first
- Roman numeral
- CCCXXXI
- Expanded form
- 300 + 30 + 1
Place value
| Place | Digit | Value |
|---|---|---|
| hundreds | 3 | 300 |
| tens | 3 | 30 |
| ones | 1 | 1 |
Number facts
- Even or odd
- Odd
- Prime or composite
- Prime
- Factors
- 1 and 331 (2 factors)
- First 10 multiples
- 331, 662, 993, 1,324, 1,655, 1,986, 2,317, 2,648, 2,979, 3,310
- Square
- 331 × 331 = 1,09,561
- Square root
- ≈ 18.19
- Sum of the digits
- 3 + 3 + 1 = 7
- Rounded to the nearest 10
- 330
- Rounded to the nearest 100
- 300
- Number before
- 330
- Number after
- 332
- In binary
101001011
Quick check
What number comes just after 331?
Show the answer
332
Is 331 even or odd?
Show the answer
Odd
What is 331 + 10?
Show the answer
341
Practise with a game
Factors, Multiples & Primes
Multiples, factors, prime numbers, square numbers and prime factors.
Roman Numerals
Read and write Roman numerals from I to 3,999.Frequently asked questions
How do you write 331 in words?
331 is written "three hundred and thirty-one".
Is 331 a prime number?
Yes. 331 is a prime number: its only factors are 1 and 331.
What are the factors of 331?
The factors of 331 are 1 and 331.
How do you write 331 in Roman numerals?
331 in Roman numerals is CCCXXXI.